The only similar device in the field so far is the radio compass, but it is clumsy and unreliable.
"I never knew anything about radio compass stations before," announced Dick.
Another development which is being used by the navigators flying the Atlantic is the radio compass.
The radio compass is dependable day or night, and is said to be quite as reliable as a sextant or other navigating instruments.
Bancroft got the message by accident--was overhauling the radio compass when he picked it up.
To catch a radiophone on wheels, Curlie had reasoned, one must mount his radio compass on wheels and pursue the offender.